amnion
noun/ˈæmniən/
/ˈæmniɑːn/
(plural amnions or amnia
(biology)/ˈæmniə/
/ˈæmniə/
)- the membrane (= thin layer) that surrounds the embryo of a human or an animalTopics Biologyc2Word Originmid 17th cent.: from Greek ‘caul’, diminutive of amnos ‘lamb’.
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amnion